> I want to modify amount of lighting based on the angle between the camera
> incidence ray and the normal vector of points in the mesh. My goal is to
> create a scanning electron microscope look: bright edges (where the angle
> between viewing ray and normal vector is larger) and a duller center
(where
> the angle is smaller).

if you don't mind using megapov0.7 instead of pov3.5 you can try the aoi
patch (angle of incidence pattern) :
http://martial.rameaux.free.fr/mael/aoi.html
http://martial.rameaux.free.fr/mael/MLPovWin.zip

M

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